Uploaded January 2015 | Updated September 2026, 1 day ago

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Features of the Marshall JCM900 Dual Reverb series


Separate preamp gain controls: Channel (A) 1-10, Channel (B) 0-20

Tone network with Treble, Middle, Bass, and Presence controls

Individual master volume controls for each channel

Separate reverb controls for each channel

Manual or footswitch operation for channel selection

Effects loop with sensitivity control

Direct and recording compensated line ouputs

Impedance selection switching

Two speaker outputs

High/low power switching (pentode to triode)

Valve failure LEDs

Entirely wired and assembled by hand in England

100 watt models (model numbers 4100, 4101, 4102) feature 4 x 5881 output valves, 3 x ECC 83 preamp valves

50 watt models (model numbers 4500, 4502) feature 2 x 5881 output valves, 3 x ECC 83 preamp valves

Note: some models came factory equipped with EL34 power tubes instead of 5881s.